The QM36 is a modular, limited bandwidth loudspeaker to be used as vertical low-mid array, either in stacked or flown configuration, for both permanent and (limited) portable installations. It is designed as low-mid extension of a QR-array. The QM36 “array in-fill” module is applied in a multiple QR-array, where the direct HF reproduction/projection of a QR is not required, but where an uninterrupted LMF line-source array is desirable for extended frequency control. The tightly spaced mid-bass transducers are fully compliant with the laws of line-array behaviour. The Signal Integrity Sensing™ pre-wiring ensures complete cable/connector compensation between the QM36 and ALC. In this way, the ALC can be loaded down to 2 ohms, without any sacrifice on response quality (2 units QM36 parallel on one channel loads 3 ohms). Typical applications for the QM-systems include “array in-fill” to a QR main system for theatre, PA system in “acoustically challenging rooms”, as well as high power side-fill stage monitoring. For full system performance, the QM36 needs to be driven by an ALC controller-amplifier. Driven by the ALC, the QM36 delivers maximum sound quality with inaudible (power and excursion) protection (SDP circuit). The system includes dedicated filtering, but system equalizing is done remotely (electronically) fully utilizing the individual speaker components’ power capacity; In combination with the unusual high peak power handling (6000W/200mS), this results in a virtually infinite headroom SPL from 1kHz.up. Typical applications for the QR-systems include main system for theatre, PA system in “acoustically challenging rooms”, as well as high power side-fill stage monitoring. For full system performance, the QR36 needs to be driven by an ALC controller-amplifier. Driven by the ALC, the QR36 delivers maximum sound quality with inaudible (power and excursion) protection (SDP circuit).